Tbh, the moments i think we'd be really that dry of Clarkson offensive punch would be when Conley went down, or another guy that took nearly as much or more off the offense than him (which i understand would be either Mitchell or Bojan, but those two we ain't expecting to get injuries the same way we are with Mike), but there's two things, one is that Conley will go down at some moment (and we shall pray and rest him enough through the regular season so it doesn't happens at the playoffs), and the other is that Clarkson can't provide the as much spacing as Bojan (and Bojan spacing for me actually stands as a bigger asset than his actual scoring right now, at least till i can see him being able to dribble drive again, as he was before injury and surgery on his finger), nor the same (quality) scoring that Mitchell does, nor playmaking and defense that Conley gives us. If Butler is a hit right away or Forrest 3pt is actually minimally reliable, that may be passable, but if either of those ain't there, i say part of (part of is important, not all, but part of) what Clarkson gives us would be replaceable with a signing like Yogi Ferrell (prototype bench pure scoring guard) or Emanuel Mudiay (more playmaking type, when he played good for us before Clarkson trade, he exactly might not be available as he signed for Zalgiris, but some other option might be there).
Clarkson spark of the bench felt much more vital at his first season when Conley weren't really in sync with Quin's system for most of the year and Mitchell couldn't make consistent reads as the ballhandler before the bubble and we actually constantly needed a guy to iso us out of trouble. Last when we had all guys available it looked pretty much like "keep feeding him whenever he's hot and he'll shoot us 20 points ahead, when he's cold, just let sex machine find another scoring option in his place", he was pretty much a wildcard (one that i loved watching, don't think that i'd be rushing to trade him, but i'd say it would be a bigger blow to our system losing Bojan shooting, for example).